Leflunomide Impurity 19 CAS 51135-73-0
| CAS No. | 51135-73-0 |
| Molecular Formula | C7H9NO3 |
| Molecular Weight | 155.15 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
Leflunomide Impurity 19 (CAS 51135-73-0) is a certified pharmaceutical impurity reference standard with the molecular formula C7H9NO3 and a molecular weight of 155.15 g/mol.
Structurally, Leflunomide Impurity 19 (C7H9NO3) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 155.15 g/mol, it falls into the medium-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
CATO manufactures Leflunomide Impurity 19 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C7H9NO3 |
| Molecular Weight | 155.15 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1971 |
| Nitrogen Atoms | 1 |
Related Leflunomide Standards
- Leflunomide EP Impurity A (CAS 455-14-1)
- Leflunomide Impurity 17 (CAS 67305-24-2)
- Leflunomide Impurity 3 (CAS 2772495-33-5)
- Leflunomide Impurity 7 (CAS 88511-40-4)
- Leflunomide Impurity 18 (CAS 17153-20-7)
- Leflunomide EP Impurity D (CAS 42831-50-5)
- Leflunomide Impurity 14 (CAS 51145-57-4)
- Leflunomide Impurity 15 (CAS 4637-24-5)
Recommended Standards
- Doxofylline Impurity 25 (CAS 6642-31-5)
- Minoxidil Impurity 14 (CAS CATO-C4X-170014)
- Doxofylline Impurity 24 (CAS 17743-04-3)
- Urapidil Impurity 25 (CAS 63959-47-7)
- Estriol Impurity 26 (CAS CATO-C4X-163726)
- Flumazenil Impurity 22 (CAS 193693-31-1)
- Tirzepatide Impurity 45 (CAS CATO-C4X-324045)
- N-(4-Bromo-1-methyl-5-pyrazolyl)pivalamide (CAS 679394-11-7)
- 1-(2-Methyl-1H-1,3-benzodiazol-6-yl)methanamine dihydrochloride (CAS 672325-34-7)
- 2-(2,6-Dihydroxyphenyl)acetic acid (CAS 64700-73-8)
- 2-(3-Oxo-3,5,6,7-tetrahydro-2H-cyclopenta[c]pyridazin-2-yl)acetic acid (CAS 1364022-61-6)
- 1,4-Dimethyl-[1,2,4]triazolidine-3,5-dione (CAS 34771-26-1)
- 1-(2-(Thietan-3-ylamino)ethyl)-1H-1,2,4-triazole-3-carbonitrile (CAS 1872998-09-8)
- Tirzepatide Impurity 24 X TFA Salt (CAS CATO-C4X-324024)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com